Apparatus for drilling and reaming and countersinking



O. F. BALTZLEY. APPARATUS FOR DRILLING AND REAMING AND COUNTERSINKING.

APPLICATION FILED MAR. 5, 1920.

Patented Dec. 21, 1920.

UNETE @FFICE.

OBEN F. BAL-TZLEY, 0F HAGEBSTOWN, MARYLAND, ASSIGNOR TO THE LIBERTY TOOLCOMPANY, OF BALTIMORE, MARYLAND, A CURPGRATION 0F MARYLAND.

APPARATUS FOR DRILLING AI J'D REAMING AND COUNTERSINKING.

Specification. of Letters Patent.

Patented Dec. 21, 1920.

Original application filed April 3, 1919, Serial No. 287,259. Dividedand this application filed March 5, 1920. Serial No. 383,526.

1/ 0 all whom it may concern Be it known that I, UREN F. BALTZLEY, acitizen of the United States, and residentof Hagerstown, State oflvlaryland have 111- vented certain new and useful Improve ments inApparatus for Drilling and lieaming and Countersinking, of which thefollowing is a specification.

My invention is an improvement upon portable apparatus for drilling,ream ng, or countersinking and one object of the invention is to providesuch an arrangement and construction of parts as will g ve largecapacity, to the machine by enabling it to be used in situations wheremachines as heretofore constructed could not be employed and is adivisional application of my co-oending application 287,259 now Patent-#1,352,6l6.

A prior form of portable machine is that shown in the patent ofDiifendall No. M l-90%, December 4. 1917, in which a cutting tool andits driver are carried by a bracket or support mounted on a frame memberor bar which has fixed thereon at 1ts end a cylinder in which works apiston forming a work feeding or holding device to feed the workrelative to the frame or member and the cuttingflevice carried therebywhen said piston is operated by fluid pressure let into the cylinder.

An objection exists to this cyllnder and piston arranged at the end ofthe irame and bevond the point where the work is done. There are workpieces of such form or of such location relative to other parts of thestructure with which they are associated that the cylinder and itspiston cannot be fitted to because of lack of space.

I therefore dispense with the cylinder and piston at the end of the mamframe member or bar and instead I provide a feed foot or what is calledin the trade a crow-foot fixed to the frame member or bar to engage andhold or feed the work piece. This frame member or bar and the tool arerelatively movable, the frame member and the tool carrier having asliding connection wlth each other. The relative movement is effected bya cylinder and piston operated by fluid pressure. the piston being;connected to one of the said parts, 2'. 6., the frame memher, and thecylinder being connected with the tool carrier so that when the fluidpressure is on there will be a relative movement between the main framemember and the tool carrier and consequently the feed foot on the framemember or bar will feed the work to the tool, if the latter is held atone position, or if the work piece is of such a character that it mustremain stationary, then the feeding movements take place at the toolcarrier.

The invention is shown in the accompanying drawing in which theapparatus is shown in elevation with parts in section.

In this drawing the main frame bar is shown at i, the feed foot at 7),held adjust ably on the frame bar by a clamp device at 7). The cylinderis shown at Z and the tool support or bracket is at Z. This tool supporthas the electric or other motor mounted therein, which is shown indotted lines at 7).

The piston within the cvlinder is shown at A and this is held adjustablyon the frame bar a as will be described later.

The cylinder is formed with or attached to the tool carrying bracket andforms the base of said bracket. The cylinder is of substantially thesame length as the bracket and occupies no more space longitudinally ofthe machine than the bracket except for a projecting stnffing box at 10.The frame bar i passes through the cylinder and piston and means must beprovided for fixing the piston to the frame bar, so that the frame barwill act like the rod of said piston and relative movement be secured ofthe bar or rod and cylinder with the tool bracket.

In the particular construction shown the piston has within it a splitcollar 11 surrounding the cylindrical frame bar 2'. A wedge member 12 isadapted to spread the split collar and thus bind said collar togetherwith the piston to the frame bar For operating the wedge a cupshaped nut13 is screw-threaded into a hole in the piston and presses the wedgeinto place.

This nut is turned by key 14 having its end to fit into the cup orsocket of the nut.

This key is permanently carried by the cylinder wall but normally it ispressed by a spring 15 out of connection with the nut, so that thepiston with its piston rod, 2'. (2., the main frame bar will be free tobe moved in the cylinder.

The key has a conical valve portion 16 to be pressed on the seat 17 inthe wall of the cylinder to prevent the escape of air. An externalhandle is shown at 18.

It will be seen from the above that by loosening the split collar theframe rod 2' and the piston can be moved relative to each other and thefeed foot and tool can be set at the desired distance apart to get theinitial or approximate setting of the parts, and at the same time thepiston may be held in the relation shown to the cylinder, 2'. 6., whilethe said adjustment is being made. This will be due to maintaining thekey in con nection with the screw nut 13.

After the parts have been adjusted the screw nut is turned to set thewedge and spread the split collar and thus fix the piston to the framebar. Thereafter by introducing fluid pressure between the right handface of the piston and the cylinder the cylinder with the tool will bemoved toward the right or relatively to the feed foot to make the toolen age and do its work upon the work piece. Tfiefore this action cantake place, however, the key 14 must have been pressed by the spring 15outwardly so that its end will be removed from the screw nut and to aposition where it will not interfere with the movement of the piston.

One end of the motor may be held by the hinged arm 6*, which is held bya hinged bolt 0. The motor at its other end is held by an externallyscrew threaded sleeve 0, operated by a finger wheel (Z. A tool ejector sis in screw-threaded engagement with the sleeve 0. It is operated by thehandle 8 and has one extension 8 provided with an ejector rod 8 toengage the shank of the tool for ejecting the same.

Having thus described my invention, what I claim is:

1. In combination in apparatus of the class described, a frame bar, afluid pressure cylinder slidably mounted thereon, a tool supportconnected with the cylinder, a feed foot connected with the frame bar,and a piston within the cylinder adjust-ably connected with the framebar, substantially as described.

2. In combination in apparatus of the class described, a frame bar, afluid pressure cylinder slidably mounted thereon, a tool supportconnected with the cylinder, a feed foot connected with the frame bar,and a piston within the cylinder adjustably connected with the framebar, said frame bar passing through the cylinder and piston coaxiallytherewith, substantially as described.

3. In combination, a cylinder, a tool support carried thereby, a pistonwithin the cylinder, a frame bar passing through the cylinder andpiston, a feed foot on the frame bar, and means extending through thewall of the cylinder for setting the piston in different positionsrelative to the frame rod, substantially as described.

4. In combination, a cylinder, a tool support carried thereby, a pistonwithin the cylinder, a frame bar passing through the piston andcylinder, a feed foot on the frame bar for presenting the work to thetool, means for clamping the piston to the frame bar, said means beingwithin the cylinder, and an operating key for said clamping means, saidcylinder having a passage in its wall for receiving the said key,substantially as described.

5. In combination, a cylinder, a tool support carried thereby, a pistonwithin the cylinder, aframe bar passing through the cylinder and piston,a feed foot on the frame bar, and means extending through the wall ofthe cylinder for setting the piston in different positions relative tothe frame rod, said clamping means comprising a screw countersunk in thepiston, substantially as described.

6. In combination, a cylinder, a tool support carried thereby, a pistonwithin the cylinder, a frame bar passing through the cylinder andpiston, a feed foot on the frame bar, and means extending through thewall of the cylinder for setting the piston in different positionsrelative to the frame rod, said clamping means comprising a split rin awedge member and a countersunk screw all carried by the piston,substantially as de scribed.

In testimony whereof I ailiX my signature.

OREN F. BALTZLEY.

